Renesas Electronics (TSE: 6723), a global supplier of semiconductor solutions, announced the RAA279974, the latest device in its automotive high-definition link (AHL) portfolio, providing automakers with a way to transmit high-definition over low-cost cables and connectors. Innovative solutions for video. The RAA279974 is a quad-channel AHL video decoder capable of processing four input sources simultaneously, making it an economical solution for surround view and multi-camera applications.
AHL technology: the future of low-cost HD video transmission
Renesas AHL technology transmits video based on modulated analog signals. Compared with the high frequency of digital transmission solutions on the market (digital transmission solutions are 3GHz or higher, while AHL technology is about 37MHz), AHL technology has strong noise immunity. This feature enables longer transmission distances (20-30 meters) using unshielded twisted pairs and standard connectors, while also supporting existing SD analog video cables and connectors. Using unshielded twisted pairs not only reduces costs, but also makes wiring in the car easier and lighter, resulting in improved energy efficiency and performance. In contrast, digital links such as SerDes require highly shielded cables and high-end connectors, which are more costly and may need to be replaced after five to seven years.
Comprehensive upgrade of RAA279974
The launch of RAA279974 not only completes the AHL product family, but also provides more economical options for surround view and multi-camera applications. The product family also includes the RAA279971 single-channel AHL video encoder and RAA279972 single-channel AHL video decoder. As most original equipment manufacturers (OEMs) want to support multiple cameras in vehicles, for applications such as surround-view parking assist monitors, the RAA279974 is an important addition to the AHL product family. AHL technology can be used with R-Car automotive SoCs, RH850 MCUs, automotive PMICs and analog components to cost-effectively implement numerous safety functions in a variety of vehicles.
Davin Lee, vice president of the Analog and Connectivity Product Group at Renesas Corporation, said: "For many consumers, multi-camera-based security systems are quickly becoming a must-have feature. The AHL system allows our customers in the automotive field to These features are available on all new vehicles, including models."
Advantages of AHL technology
AHL technology not only reduces costs, but also brings powerful anti-noise capabilities and excellent image quality. The basic characteristics of analog signals make AHL video transmission have superior anti-noise and anti-interference capabilities. In contrast, digital links may suffer image loss due to noise or interface issues, and AHL will preserve good real-time images in these environments, providing a higher security solution.
Key features of AHL technology:
- Supports resolutions from VGA to 720p/60 or 1080p/30, and can achieve non-standard vertical resolutions.
- Provides flexible interfaces to support various image sensors, including MIPI-CSI2, BT656 and DVP input and output.
- No compression steps required like Ethernet systems, so no video lag.
- Only a 27MHz crystal clock is required, and the internal PLL can generate the clock frequency required for higher resolution, reducing costs.
- Passed BCI and CISPR25 EMC/EMI tests based on UTP cable.
- MIPI-CSI2 output with virtual channels allows 4 video channels to be sent to the SoC via a single data bus interface, saving input ports on the SoC.
Overall, the launch of RAA279974 marks further innovation of AHL technology in the field of automotive video transmission, providing automakers with more economical and high-performance solutions and helping to promote the rapid popularity of multi-camera security systems.
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